The quartz is used to heal. It is the most easily obtained crystal. It is said the high vibrations of these quartz can stabilize harmonies (but it can destabilize too so it is difficult keeping undercontrol ) . There are many types of quarzts . Citrine is called Topaz of the Brazil . It is recommended for the nervous and digestive systems, as well as diabetes. The citrine can reduce destructive thoughts and improve self-esteem.